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Contains:  Witch Head nebula, IC 2118, The star τOri, The star Rigel (βOri), The star λEri, The star 68Eri, The star Cursa (βEri), The star 66Eri, The star ψEri, The star 63Eri, The star 62Eri, Part of the constellation Eridanus (Eri)
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Witch Nebula, 





    
        

            Roberto Colombari
Witch Nebula

Witch Nebula

Technical card

Resolution: 3077x2495

Astrometry.net job: 1413810

RA center: 76.749 degrees

DEC center: -7.785 degrees

Pixel scale: 8.620 arcsec/pixel

Orientation: -90.128 degrees

Field radius: 4.743 degrees

Description

Witch Nebula
This image comes from another stunning set of data of our Rokinon 135mm and QSI583.
The integration refers just to broad filters (LRGB).

[In a second phase, I'll use it as RGB on a big DSS-POSS 2 mosaic]

L: 64x300s @ F2.8
RGB: (15, 18, 14)x300s @ F2.8

Copyright: R. Colombari
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IC 2118 (also known as Witch Head Nebula due to its shape) is an extremely faint reflection nebula believed to be an ancient supernova remnant or gas cloud illuminated by nearby supergiant star Rigel in Orion. It lies in the Eridanus constellation, about 900 light-years from Earth. The nature of the dust particles, reflecting blue light better than red, is a factor in giving the Witch Head its blue color. Radio observations show substantial carbon monoxide emission throughout parts of IC 2118 an indicator of the presence of molecular clouds and star formation in the nebula. In fact candidates for pre-main sequence stars and some classic T-Tauri stars have been found deep within the nebula.[1]

The molecular clouds of IC 2118 are probably juxtaposed to the outer boundaries of the vast Orion-Eridanus bubble, a giant supershell of molecular hydrogen blown by the high mass stars of the Orion OB1 association. As the supershell expands into the interstellar medium, favorable circumstances for star formation occur. IC 2118 is located in one such area. The wind blown appearance and cometary shape of the bright reflection nebula is highly suggestive of a strong association with the high mass luminous stars of Orion OB1. The fact that the heads of the cometary clouds of IC2118 point northeast towards the association is strong support of that relationship.

Source: Wikipedia

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Author

rob77
Roberto Colombari
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Witch Nebula, 





    
        

            Roberto Colombari

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Imagers of Italy